Ist 331 class 6 [5 min.]frank ritter, 11 sept 14

• Computers/phones still off

• Questions?

• Fill out two surveys

• Project 1 abstracts in [15 min.]

• ABCS1, 2, 3 [20 min.]

• IS lab [20 min.]

• Learning lab

Project 1 [15 min.]

• Handin• Questions,• Concerns, • Things to share?

Ch 1 ABCS

• Anthropometrics• Behavior• Cognitive• Social

These are everywhere, even on Reddit

Chapter 4

1. Posture

2. Haptic and kinesthetic and the other 5 senses

3. Fitts law

Ch 3 Fitts Law [10 min.]

Fitts Law

• Time to move =

– Constant + rate * ID

– 150 + 100 log2(2d/w)

– 70 log2(d/w + 0.5)

• Implications

– Make d short

– Make W large

– W on edge is infinite

– Make d 0

– Make constants small (e.g., pointing finger vs. complex joystick; clean mouse vs. rat)

– Move to keystroke

d

w

target

Typing• 10-80 wpm• Faster with practice• Differ by letter, pair, word• 3% errors (hmm), but 30% time

Lab 1 [20 min.]

• Questions,• Concerns, • Things to share?

Lab 2 [5 min.]

• Overview of lab• Pick your task carefully

– About 1 min. is ok, 30 sec a bit better, 10 s too fast, 2 min. too slow (typically, for lab, not for project)